Sand trap and strainer



A filZl, 1925. 1,534,129

W. L. 'MARDEN I SAND TRAP AND STRAINER Filed June 15, 1923 avwemto'c 3}{AI/l awe (mew M ,4 KW

Patented Apr. 21, 1925.

UNITE STATES PATENT OFFICE.

WILLIAML mnnnnmor NEW YORK, N.,"Y., ASSIGNOR r nnrrunn METER comranzorNEW YORK, n. Y., A CORPORATION or NEW annsny.

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To all whom it may concern:

Be it known that I, WILLIAM L. MARDEN, a citizen of the United States,residing in the borough of Queens of the city of New York, in the Stateof New York, have invented certain new and useful Improvements in SandTraps and Strainers, of which the following is a specification,reference being had to the accompanying drawing, forming a part hereof.

This invention has for its object to provide for the elimination of sandand other foreign substances from water as it passes on its way tometers, pumps, boilers, etc.,

which shall be highly efiicient, shall not become clogged quickly, shallbe capable of being cleaned readily when necessary, and shall be easy tomanufacture. j The invention will be fully described hereinafter withreference to the accompanying drawing in which it is illustrated and inwhich Figure 1 is a view partly in vertical section and partly inelevation of a sand trap and strainer which embodies the invention,

a portion of the sand receptacle being broken out to save space.

Figure 2 is a view of the same in horizontal section on the plane of theaxes of the inlet and outlet.

The improved sand trap and strainer comprises a vessel a, which may beof cast metal, substantially cylindrical, provided at b with an openingwhich may be threaded for engagement with an outlet pipe. The open upperend of the vessel or casting a is closed by a removable cap d, held bybolts 6, and a gasket 7, while the bottom a has an opening a preferablythreaded for engagement by a sand receiver 9 which may have its lowerend closed by a removable cap it. Within the vessel a is formed ahorizontal wall or partition a and'a vertical wall or partition a whichset off a chamber a in free communication with the outlet 0. Thehorizontal or transverse wall a is formed with an opening in whichisfitted closely a foraminous, preferably cylindrical strainer 2' whichat its upper end fits tightly against the gasket f or the cap plate 03and at its lower end, within the chamber a below the wall or partition.a is open. This strainer a is not only vertical and projected downwardwithin the chamber a, but is substantially aligned with the sandreceiver 9. Between the inlet b and the strainer z is disposed a morecoarsely foraminous partition is also preferably vertical, resting atits lower end on the bottom a of the main casting, bearing at itsvertical edges against ledges a formed on the inner surface of the maincasting a, and in contact at its upper end with the gasket f or cap d.

In the use of the strainer the relatively larger and lighter foreignsubstances which may be brought in with the water are caught by thestrainer is and are retained, within the inlet chamber a being therebyprevented from passing on with the water and from clogging the finerstrainer 11. The water which passes through the strainer 70, carryingwith it the finer particles of great er specific gravity, as of sand,has its velocity checked as it passes through the strainer 70, has itsdirection of flow changed from the horizontal and downward to an upwarddirection and has an opportunity to circulate or eddy in the chamber a,thereby facilitating the deposit of such particles and theiraccumulation in the sand receiver g. From the chamber a the water,carrying the still finer particles of heavier material which have notbeen deposited, passes upward into the interior of the strainer 11, andeventually passes through the foramina of this strainer into the chambera above the horizontal or transverse partition a and so to the outlet 0.The finer particles which are prevented from passing through thestrainer 2' slip down the vertical wall of the strainer and falltherefrom into the still water of the receiver 9. Such sand or otherheavy material as accumulates in the receiver 9 can be blown out fromtime to time upon the removal of the cap it and both strainers i and iscan be cleaned as required upon the removal of the cap (5 and gasket f.hen the flow of water is cut off, during the cleaning of the strainer,such particles of the relatively lighter material as may have beenstopped by the strainer 70 will settle in the chamber h, which can becleaned out readily as by the removal of the strainer and the pushingforward of the material into the mouth of the receiver 9. Both thestrainer i and the strainer 72 can be lifted out, when the cap (Z isremoved, for the purpose of permitting them to be cleaned more readilyif desired.

I claim as my invention:

A sand trap and strainer comprising a vessel having an inlet and anoutlet, an open top with a removable cap and a discharge opening in itsbottom, a transverse and vertical partition forming a chamber Within themain vessel, a finely foraminous, substantially cylindrical strainersupported in the transverse partition and having its lowvessel betweenthe inlet and the finely,

foraminous strainer and hearing at its lower end against the bottom ofthe main vessel, at its vertical edges againstthe sidesofthe mainvessel, and at its upper edge against the removable cap.

This specification signed this 8 day of June A. D. 1923.

WILLIAM L. MARDEN.

